Mars colonist candidate expresses grave doubts about mission

HOUSTON (Reuters) - A contender for a one-way mission to Mars says the venture is unrealistic and will not work, according to an essay by the candidate published on Wednesday.

Joseph Roche, an astrophysicist and lecturer at Trinity College in Dublin, Ireland, is among 100 finalists selected by Mars One, a nonprofit Dutch organization, for possible permanent resettlement on Mars in 10 years.